View all text of Subpart N [§ 52.670 - § 52.691]
§ 52.671 - Classification of regions.
The Idaho plan was evaluated on the basis of the following classifications:
Air quality control region | Pollutants | Particulate matter | Sulfur oxides | Nitrogen dioxide | Carbon monoxide | Ozone | Eastern Idaho Intrastate | I | II | III | III | III. | Eastern Washington Northern Idaho Interstate (Idaho) | I | II | III | III | III. | Idaho Intrastate | I | III | III | III | III. | Metropolitan Boise Intrastate | II | III | III | I | III. |
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